<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片区域 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert
                title="添加商品信息"
                type="info"
                center
                show-icon
                :closable ="false">
            </el-alert>
            <el-steps :space="200" :active="activeIndex - 0" 
            finish-status="success" 
            align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>

            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" 
            ref="addFormRef" 
            label-width="100px"
            label-position="top">

            <el-tabs :tab-position="'left'"
            v-model="activeIndex"
            :before-leave= 'beforeTabLeave'
            @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name='0'>
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                            expand-trigger='hover'
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange">
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name='1'>
                    <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" 
                    v-for="item in manyTableData"
                    :key='item.attr_id'>
                        <!-- 复选框组 -->
                         <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cd"
                            v-for="(cd,i) in item.attr_vals" :key='i'
                            border></el-checkbox>
                        </el-checkbox-group>
                         
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name='2'>
                    <el-form-item :label="item.attr_name" 
                    v-for="item in onlyTableData"
                    :key='item.attr_id'>
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name='3'>
                        <!-- 上传图片 action表示图片要上传到的后台API地址 -->
                        <el-upload
                        class="upload-demo"
                        action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers='headerObj'
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>             
                </el-tab-pane>
                <el-tab-pane label="商品内容" name='4'>
                    <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce"> </quill-editor>
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%"
        :before-close="handleClose">
        <img src="previewPath" alt="" class="previewImg">
        </el-dialog>


    </div>
</template>
<script>
import _ from 'lodash'

export default{
    data(){
        return{
            activeIndex: 0,
            // 添加商品的表单数据对象
            addForm: {
                goods_name: '',
                goods_price: '',
                goods_weight: '',
                goods_number: '',
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[]
            },
            addFormRules: {
                goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
                goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
                goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
                goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
                goods_cat:[{ required: true, message: '请选择商品分类', trigger: 'blur' }]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label: 'cat_name',
                value: 'cat_id',
                children: 'children'
            },
            // 动态参数列表数据
            manyTableData: [],
            // 静态属性列表数据
            onlyTableData:[],
            // 上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传的组件的headers请求对象
            headerObj:{
                Authorization: 
                window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false,
            // 商品的详细描述
            goods_introduce: '',
            attrs:[]
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类数据失败！')
            }
            this.catelist =res.data
            console.log(this.catelist);
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat);
            if(this.addForm.goods_cat.length !== 3){
                this.addForm.goods_cat = []
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            // console.log('即将离开的标签页名字是:' + oldActiveName);
            // console.log('即将进入的标签页名字是:' + activeName);
            // return false

            if(oldActiveName === '0' && 
            this.addForm.goods_cat.length !== 3){
                this.$message.error('请选择商品分类！')
                return false
            }

        },
        async tabClicked(){
            // console.log(this.activeIndex);
            // 证明访问的是动态参数面板
             if(this.activeIndex === '1'){
                // console.log('动态参数面板');
                const {data:res} = await 
                this.$http.get(`categories/${this.cateId}/attributes`,
                {
                    params:{sel:'many'}
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                // this.$message.success('获取动态参数列表失败！')
                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals =
                    item.attr_vals.length === 0 ? []
                    : item.attr_vals.split('')
                });
                this.manyTableData = res.data
            }else if(this.activeIndex === '2'){
                const {data:res} = await 
                this.$http.get(`categories/${this.cateId}/attributes`,
                {
                    params:{sel:'only'}
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取静态参数列表失败！')
                }
                // this.$message.success('获取静态参数列表失败！')
                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals =
                    item.attr_vals.length === 0 ? []
                    : item.attr_vals.split('')
                });
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file);
            this.previewPath =
            file.response.data.url
            this.handlePreview = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            // console.log(file);
            // 1.获取将要删掉的图片的临时路径
            const filePath = 
            file.response.data.tmp_path
            // 2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex(x => {
                x.pic === filePath
            })
            // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        // 监听图片是否上传成功的事件
        handleSuccess(response){
            console.log(response);
            // 1.拼接得到一个图片信息
            const picInfo ={pic:
            response.data.tmp_path
            }
            
            // 2.将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        add(){
            // console.log(this.addForm);
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项!')
                }
                // 指添加的业务逻辑
                // lodash cloneDeep(obj)
                const form = _.cloneDeep(this.addForm)
                this.addForm.goods_cat =
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item => {
                    const newInfo ={attr_id: item.attr_id,
                    attr_value: item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item =>{
                    const newInfo ={attr_id: item.attr_id,
                    attr_value: item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);

                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const {data:res} = 
                await this.$http.post('goods',form)
                
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        },
        handleClose(){

        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>
